Crossword Genius

A large island south of Borneo, primarily? (4)

Ross

I believe the answer is:

bali

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'a large island south of borneo primarily?' is the definition.
I can't tell whether this defines the answer.

'a large island south of borneo primarily?' is the wordplay.
'large' becomes 'l'.
'island' becomes 'i'.
'south of' is a charade indicator (letters next to each other).
'primarily?' says to take the initial letters (I've seen 'primarily' mean this).
The initial letter of 'borneo' is 'b'.
'a'+'l'+'i'='ali'
'ali' put after 'b' is 'BALI'.

Can you help me to learn more?

(Other definitions for bali that I've seen before include "Bail out of the island" , "mountainous island" , "Javanese island" , "Indonesian island, capital Denpasar" , "Holiday island to the east of Java" .)

I've seen this clue in The Telegraph.
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